Propeller



Feb.11,194 1. A. E. GREENE 2,231,827

Filed Aug a1, 1938 fibre/2am [411' n Greene.

l H ORA/E) Patented Feb. 11, 1941 L UNITED :STATES F'PATENT OFFICEAbraham Edison Greene, Carmanville,

Newfoundland Application August a1, 1938, Serial No. 227,861

2 Claims. (01. 17o 159) This present invention relates to certain newand useful improvements in a propeller.

The primary object of the invention resides in the provision of apropeller ofgenerally improved and simplified construction and increased"emciency.

The invention has for another'object the provision of a propeller of thecharacter stated which is constructed so as to operate against the waterand force the same 'rearwardly so as to obtain the highest efficiency ofoperation of the propeller and the maximum forward movement of thepropeller and the boat operated thereby, with the minimum strain onthe'propeller.

The invention has for a further object the provision of a propeller ofthe character stated by means of which a boat may be propelledat themaximum speed or stopped in the minimum period of time, with the maximumstrain on the propeller at all times.

The invention has for a still further object the provision of apropeller of the character stated which is of simple and inexpensiveconstruction as well as increased efficiency and may be readilymanufactured at small cost and installed on the propeller shaft of boatsof various types and may be retailed at a popular price with goodprofit, thus providing a commercially attractive proposition.

To the accomplishment of these and related objects as shall becomeapparent as the description proceeds, my invention resides in theconstruction, combination and arrangement of parts as shall behereinafter more fully described, illustrated in the accompanyingdrawing, and pointed out in the claims hereunto appended.

The invention will be best understood and can be more clearly describedwhen reference is had to the drawing, forming a part of this disclosure,wherein like characters throughout the several views.

In the drawing Figure 1 is a front elevation of the improved propeller;and

Figure 2 is a side elevation, at right angles to Figure 1.

Referring more in detail to the drawing, it is to be noted that thepropeller includes a sleeve 6 of elongated form and having alongitudinal slot 1 therein, whereby the propeller sleeve 6 may bereadily keyed to the propeller shaft of a boat or the like. A pair offorward reversely extended arcuate propeller blades 8 project radiallyfrom diametrically opposite portions of the propeller sleeve 6, near theforward end of the latter, said indicate like parts sleeve G'thusserving. as a hub.' The blades 8 on issuing from the sleeve 6' swingthrough about 180 in a free'wing, increasing in width from their innerattached ends to their outer ends with their free extremities 9 cutstraight across and the corners in thereof rounded. The blades 8 are notcurved transversely, having relatively fiat forward and rear faces,always'in aplane at right angles to the .axisof said sleeve but moverearwardly gradually from their inner fixed ends to their free outerends 9, the two blades 8 describing an arc oppositely directed from thesleeve or hub s so as to follow one another during rotation of thepropeller. A second, similar pair of propeller blades. II have theirnarrow inner ends extended from diametrically opposite points on thepropeller sleeve or hub 6, near the rear end of the latter and at rightangles to the points of connection of the first mentioned blades 8 withsaid sleeve or hub 6. This second pair of propeller blades I I also onissuing from the sleeve 6 swing through approximately 180 and increasein width from their attached inner ends to their free outer or rear endsI2 which are cut straight across with the corners I3 thereof rounded andlikewise; this second pair of blades I I are gradually bent rearwardlyfrom their fixed inner ends to their free outer ends I2, although theblades II are not curved transversely. The two blades II describe arcssimilar to those described by the blades 8 with each blade I I extendedoppositely from the other so that they will follow one another in thewater, during operation of the propeller. By this construction andarrangement of the blades 8 and I I, which are of relatively thinmaterial, on the sleeve or hub 6, each of the pairs of blades 8 and I I,together with the sleeve or hub 6 appear to describe the letter 5 whenlooking at one end of the propeller sleeve or hub 6 with the two Ssarranged at right angles with one in front of and overlapping the other;the individual blades 8 and I l of each of the pairs thus passingthrough an angle at the axis of more than As the construction of thedevice has thus been described in detail, brief reference is now had toits use and modus operandi: This propeller may be manufactured as aleft-turn propeller or a right-turn propeller, as desired, In eithercase, rotation of the propeller with the propeller shaft on which it ismounted, will result in forcing the boat forwardly when the propeller isrotated in one direction and reversing the movement of the boat when therotation of the propeller is reversed. Thus, when it is desired to stopforward movement of the boat, rotation of the propeller constructedwithin the scope of the appended claims, without departing from thespirit or scope thereof, it is intended that all matters contained inthe said accompanying specification and drawing, shall be interpreted asillustrative and not in a limitative or restrictive sense.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A propeller including an elongated propeller sleeve adapted to bekeyed on a propeller shaft; forward and'rear pairs of propeller bladesarranged to extend respectively from said sleeve at right angles to oneanother and in overlapping relation; each of said blades beingconstructed of thin material with flat forward and rear. faces; eachblade being increased in width from its inner end attached to thepropeller sleeve adjacent one end of the latter, to, the outer wide andspaced free end of the blade; each pair of blades, together with theintermediate portion of the sleeve in end elevation substantiallydescribing an 8; said blades being thrust rearwardly from their innerends to their outer ends.

2. A- propeller including an elongated propeller sleeve adapted to bekeyed on a propeller shaft; a pair of forward blades of substantiallyarcuate form extending radially from diametrically opposite portions ofsaid sleeve adjacent the forward end thereof; the blades of said forwardpair increasing in width as they extend outwardly from said sleeve,being oppositely turned and describing .each an arc of approximately 180a corresponding pair of rear blades of like design extended radiallyfrom diametrically opposite portions of said sleeve adjacent the rearend thereof and from points at right angles to the points of attachmentof said first mentioned pair of blades; each pair of said bladestogether with the intermediate portion of the sleeve in end elevationsubstantially describing an S and said blades individually passingthrough an angle of more than 90 at the axis overlap so that in endelevation a continuous unbroken propeller surface or area is provided,said blades being constructed of thin material and having flat forwardand rear faces always in a plane at right angles to the axis of saidsleeve.

' ABRAHAM EDISON GREENE.

